Moderated Poster

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MP18-10: Comparison of planar scintigraphy and single-photon emission computed tomography /computed tomography (SPECT/CT) in preoperative imaging of sentinel lymph nodes in penile cancer patients

Friday, May 12
3:30 PM - 5:30 PM
Location: BCEC: Room 153

Presentation Authors: Carsten Maik Naumann*, Moritz Franz Hamann, Christian Colberg, Klaus-Peter Jünemann, Daniar Osmonov, Ulf Lützen, Kiel, Germany

Introduction: The aim of this study was to evaluate the diagnostic value of SPECT/CT and planar lymphoscintigraphy in preoperative imaging of sentinel lymph nodes in penile cancer patients with non-palpable inguinal lymph nodes.

Methods: Radio-labelling of sentinel nodes was performed by intradermal and peritumoral injection of 150MBq Tc-99 m-labelled nanocolloids according to the two day protocol. Image acquisition of planar scintigraphies was carried out by a twin head gamma camera (Siemens, ECAM and Symbia S) and indirect body contouring. Additionally, we subsequently performed SPECT/CT of the abdomen und inguinal regions using a twin-head hybrid camera system (Siemens Symbia T and Symbia Intevo). Imaging data of both modalities were prospectively evaluated by two experienced physicians in consensus reading in 52 groins of 26 patients with this tumor entity.

Results: A total of 71 SLNs in 37 groins were identified by planar scintigraphy. Non-visualization was observed in 15 (28.8%) inguinal basins using planar scans. 82 SLNs in 42 groins were detected by SPECT/CT (non-visualization in 10 (19.2%) groins). SPECT/CT revealed 8 inguinal hotspots as shown by planar imaging in 7 groins as false positive. 19 inguinal SLNs in 16 groins were missed on planar imaging and could be detected by SPECT/CT only. In contrast to 2D planar scintigraphy, SPECT/CT allowed to determine the precise anatomical localization of the SLNs in all 42 groins.

Conclusions: SPECT/CT is capable of detecting SLNs missed by planar imaging, it reduces the number of false positive findings and shows the morphological location of SLNs more accurately. If available, SPECT/CT should be used for preoperative SLN imaging in penile cancer patients with non-palpable inguinal lymph node status.

Source Of Funding: None

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MP18-10: Comparison of planar scintigraphy and single-photon emission computed tomography /computed tomography (SPECT/CT) in preoperative imaging of sentinel lymph nodes in penile cancer patients



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